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  #21  
Old 02-27-2020, 05:50 PM
Spencer Spencer is offline
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Got out my spare Argon tank.

Rigged up some tubing to connect the Argon fitting to the air fitting.

Did a big blast and then slow purge For a while, then turned it up again before I started welding.
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  #22  
Old 02-27-2020, 08:37 PM
Spencer Spencer is offline
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This was like Welding a moving pendulum.

If it was better weather I could have moved some stuff outside to put this on a work bench, but I didn't.

I burned through the top of the tank and had to weld In a mend plate below the new bracket.

Not my finest welds by any means, but it's done.
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  #23  
Old 02-28-2020, 09:32 AM
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JWS JWS is offline
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Now what have you done to prepare the inside of the tank? Any coating has burnt and is probably peeling. It will find its way to your gas tank and carb. Will rust from the inside out.

With that said. Glad to see the final result as that meant you survived. Some things aren't worth dying over. This is one thing I have eliminated doing or helping others do.
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  #24  
Old 02-28-2020, 09:37 AM
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digger doug digger doug is offline
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I only cut on tanks, so take this as you will.

I believe if you filled it with water, the large cooling sink of water would have
helped you from burning thru.
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  #25  
Old 02-28-2020, 09:46 AM
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Quote:
Originally Posted by Spencer View Post
Got out my spare Argon tank.

Rigged up some tubing to connect the Argon fitting to the air fitting.

Did a big blast and then slow purge For a while, then turned it up again before I started welding.
Good. That's the right way. When I am using exhaust the truck stays running though out the job, so when you cut into it you get exhaust coming out at you. Argon works the same.
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  #26  
Old 02-28-2020, 10:47 AM
FabberMcGee FabberMcGee is offline
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I have welded many gasoline tanks over the years. Some with several gallons of gas inside, usually in a boat where it is a big job to remove the tank. I always charge them with CO2. It's cheap and heavy. It fills the tank from the bottom up, pushing out the lighter gasoline fumes and oxygen and has a very distinct (annoying, stings your nose) odor. I make sure the vent is at the very highest part of the tank and there are no places to trap fumes in a high corner or weird shaped place. I let the Co2 flow at a good rate until when I put my nose in front of the outflow stream it is definitely CO2 coming out. That way the tank is completely full of non combustible gas and can not explode.
I leave the CO2 flowing while I weld and have checked the outflow with a little propane torch. There is enough CO2 coming out the end of the vent hose that it will put the flame out for about a foot distance before it mixes with enough oxygen in the air to support a flame.
The first time or two I was pretty nervous about it even though I was sure it was safe. But, I always look it over carefully and cautiously before I weld. Not recommending that anyone else do this, but that's how I do it.
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  #27  
Old 03-01-2020, 12:19 PM
Spencer Spencer is offline
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Quote:
Originally Posted by JWS View Post
Now what have you done to prepare the inside of the tank? Any coating has burnt and is probably peeling. It will find its way to your gas tank and carb. Will rust from the inside out.

With that said. Glad to see the final result as that meant you survived. Some things aren't worth dying over. This is one thing I have eliminated doing or helping others do.
I had not thought about or planned on doing anything to the inside of the tank. If there is something I can to do the inside of the tank to prevent an issue I'd like to hear about it.

Here is a picture taken through the filler cap. You can only see the manufacturers welds in this photo, but I'll try to find my tool I use to look inside walls to see if I can get a decent pic of the areas I welded.
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  #28  
Old 03-01-2020, 01:27 PM
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I have used this and it works good!
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